#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,j=1;
	cin>>n;
	do{
		if(j%3==2&&j%5==3&&j%7==2) i++;
		j++;
	} while(j<=n);
	cout<<i;
}
/**************************************************************
	Problem: 1055
	User: linzihang
	Language: C++
	Result: Wrong Answer
****************************************************************/